An open reading frame (ORF 1) located upstream of the polyhedron envelope protein gene in the multinucleocapsid nuclear polyhedrosis virus (OpMNPV) genome was cloned in-frame into a bacterial expression vector. The fusion protein produced by this construct was used for the preparation of a monospecific antiserum. Western blot analysis of extracts from OpMNPV-infected cells and NPV (AcMNPV)-infected cells detected a 24K protein late in infection. This antiserum also reacted with a 24K protein in preparations of budded and polyhedra-derived virus from OpMNPV and AcMNPV. The 24K protein was not -glycosylated. Immunoelectron microscopy confirmed that the OpMNPV p24 is associated with nucleocapsids of budded and polyhedra-derived virions.


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